I just found out that this invader who I thought was trolling me over and over again is actually an in-game enemy. I'm still having a hard time believing it because this thing I swear learned.

I thought I would just run around the map until he got bored and would leave my world but I swear it learned my tactics and countered until it killed me.

After my 5th time being invaded, I found a new route to run and he was at the bottom of a cliff walking back and forth honestly looking like he was just mocking me.

I started doing ranged attacks and he started dodging, not as a NPC would, but as real person would to try and predict where the attack would go. What made me Google this encounter and find out that it was AI is because it never healed.

I play a lot of games and I have never had an AI encounter be so friggin believable... Holy cow that was awesome.